Since the YourSites client plugin is unique to each combination of server and client site it cannot be currently be updated using the Joomla updater.
If you upgrade YourSites and need to update the client plugins.
You can do this from the list of sites in YourSites. Select all your sites and click the 'YourSites -> Upgrade YourSites' button or click the plugin version icon on a site by site basis.
We love every single one of our users, without you YourSites simply couldn't happen! So we would love a review at the Joomla! JED so we can let others know about us too, please take a minute to write a review:
If you feel you have something negative to say, we would implore you to speak to us first, as we really really don't want anyone to be unhappy!